GW Rule #5       If you cough, sneeze, sigh, or yawn, do it not loud but privately, and speak not in your    yawning, but put your handkerchief or hand before your face and turn aside.

PEEVES               Covereth your mouth with a Kleenex, paw, or turn away for a sneeze, cough, or yawn.

MADAMA              Nobody wants your germs.  Covering means you care about the welfare of others.

SANDRA                Can you say contagious?  Also, openly yawning makes others feel you’re boring them.